ref: Make SentrySession have a swift interface

[noahsmartin]

Creates a Swift wrapper for SentrySession, and updates all callosities to using the wrapper (by changing the name of the ObjC type so it's now just an implementation detail)

This is because I'm trying to write a runloop observer feature all in Swift, and it requires SentryFileManager, which is blocked from being used in Swift APIs by SentrySession according to the latest ObjC to Swift conversion dependency tree: https://github.com/getsentry/sentry-cocoa/actions/runs/16677150074/job/47206480213

#skip-changelog

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.761%. Comparing base (3279d4e) to head (047b92d).
⚠️ Report is 5 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #5785       +/-   ##
=============================================
+ Coverage   86.704%   86.761%   +0.057%     
=============================================
  Files          425       426        +1     
  Lines        36748     36831       +83     
  Branches     17363     17407       +44     
=============================================
+ Hits         31862     31955       +93     
+ Misses        4839      4830        -9     
+ Partials        47        46        -1     

Files with missing lines	Coverage Δ
SentryTestUtils/TestClient.swift	82.677% <ø> (ø)
SentryTestUtils/TestTransportAdapter.swift	84.210% <ø> (ø)
Sources/Sentry/SentryClient.m	98.940% <ø> (ø)
...rces/Sentry/SentryCrashIntegrationSessionHandler.m	100.000% <ø> (ø)
Sources/Sentry/SentryEnvelope.m	88.839% <ø> (ø)
Sources/Sentry/SentryHub.m	98.086% <ø> (ø)
Sources/Sentry/SentryMigrateSessionInit.m	94.117% <ø> (ø)
Sources/Sentry/SentryScope.m	97.091% <ø> (ø)
Sources/Sentry/SentrySerialization.m	98.905% <ø> (ø)
Sources/Sentry/SentrySessionInternal.m	99.512% <100.000%> (ø)
... and 1 more

... and 5 files with indirect coverage changes

---

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[philipphofmann]

I found one potential issue. Apart from that LGTM.

[philprime]

LGTM

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1223.02 ms	1255.29 ms	32.27 ms
Size	23.75 KiB	944.16 KiB	920.41 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
6cb4338	1238.47 ms	1256.96 ms	18.49 ms
55f739c	1226.06 ms	1248.78 ms	22.71 ms
ae7be93	1236.24 ms	1258.18 ms	21.94 ms
2675d3c	1218.94 ms	1239.36 ms	20.42 ms
3c86ff3	1227.82 ms	1239.73 ms	11.91 ms
7eafbde	1212.16 ms	1243.64 ms	31.48 ms
01faa71	1238.81 ms	1263.98 ms	25.17 ms
2a6f451	1212.89 ms	1237.45 ms	24.56 ms
fac4ca3	1222.81 ms	1235.83 ms	13.02 ms
5cfc768	1220.74 ms	1245.06 ms	24.32 ms

App size

Revision	Plain	With Sentry	Diff
6cb4338	23.75 KiB	913.63 KiB	889.88 KiB
55f739c	23.75 KiB	858.73 KiB	834.98 KiB
ae7be93	23.75 KiB	879.24 KiB	855.49 KiB
2675d3c	23.75 KiB	928.16 KiB	904.41 KiB
3c86ff3	23.75 KiB	919.69 KiB	895.94 KiB
7eafbde	23.75 KiB	927.53 KiB	903.78 KiB
01faa71	23.75 KiB	926.77 KiB	903.02 KiB
2a6f451	23.75 KiB	913.13 KiB	889.38 KiB
fac4ca3	23.75 KiB	902.01 KiB	878.27 KiB
5cfc768	23.75 KiB	850.73 KiB	826.98 KiB

Previous results on branch: sentrySessionSwiftWrapper

Startup times

Revision	Plain	With Sentry	Diff
ae623da	1246.94 ms	1275.14 ms	28.20 ms
71746be	1219.73 ms	1245.02 ms	25.29 ms

App size

Revision	Plain	With Sentry	Diff
ae623da	23.75 KiB	940.19 KiB	916.44 KiB
71746be	23.75 KiB	932.41 KiB	908.66 KiB

[github-actions]

🚨 Detected changes in high risk code 🚨

High-risk code can easily blow up and is hard to test. We had severe bugs in the past. Be extra careful when changing these files, and have an extra careful look at these:

• Sources/Sentry/SentrySerialization.m